public class E3 {
   public static void main (String args[]) {
     long [] a = {1,2,3,4};
     long [] b = {100,200,300,400,500};
     b=a;
     System.out.println("数组b的长度:"+b.length);
     System.out.println("b[0]="+b[0]);
   }
}
